Brady Oestrike, 31, beheaded Charles Oppenneer, 25, and killed Brooke Slocum, 18, who was eight months pregnant, in July 2014, investigators said, adding that Oestrike killed himself after a police chase. Oppenneer's head was never found, Fox 17 reported.

The videos obtained through a Freedom of Information Act request were recorded in the days and hours before the murders. Oestrike had set up four surveillance cameras around his home in the city of Wyoming.

The first video is dated July 5, 2014, the weekend before Oppenneer was killed and Slocum was abducted. The video shows Oestrike hanging ropes from his basement ceiling and holding a whip. He also walks by with a chain and padlock and lays out underwear.

Investigators collected at least 400 items from Oestrike's home, including firearms, ammunition and knives. They also seized electronics and the victims' possessions.